Grate bar



c. P. OAKMAN GRATE BAR Filed Nov. 1919 Feb 26 1924.

Patented Feb. 26, W24.

GTE BAR.

Application filed November 28, 1919. serial Ho. 840,9.

To all whom it may concern:

Be it known that I, CHARLES P. OAKMAN,

a citizen .of the United States, residing at Cambridge in the county ofMiddlesex and a State of .assachusetts, have invented certainImprovements in Grate Bars, of which the following description, inconnection with the accompanying drawings, is a specification, likereference characters on the drawings indicating like parts in theseveral: figures.

This invention relates to grate bars of the type used in automaticstokers. A common commercial type of automatic stoker comprises a seriesof segments or sections jointed together to form an endless grate whichis driven at aslow but substantially uniform rate of speed. The sectionsor segments of this grate each consists essentially of a bar thatextends transversel of the grate and supports a series of grate ars orgrate elements, the ends of the supporting bar being carried by suitablelinks. Usually the support consists of a dove-tail bar and the gratebars themselves are each notched or grooved to slide longitudinally onthis bar, the "entire series of bars makin up an individual segment orsection and being held in place by master bars at the ends of eachsection. A well known example of this construction is the Coxe stoker.

Whenever one of these grate bars becomes broken, it is necessary to stopthe movement of the grate, remove the master bar, and slide old the barsup to the broken member. The broken bar can then be removed and a newone substituted for it, after which the bars that have been-removed arereplaced in their original positions It is obvious it is especiallyobjectionable because it reat accompanying drawings, and the novelfeathat this operation consumes much time and tures will be articularlypointed out in the a pended c aims.

Re erring now to the dra Figure 1 is an angular view of a part of agrate bar support on which are mounted two grate bars constructed inaccordance wlth this invention; and

Fig. IS a fragmentary vertical cross sect1ona1 v1ew through one of thegrate bars shown in Fig. l and its support.

The grate bar support 2 shown in the drawlngs is of the usualconstruction and consists of a relatively flat bar of a dovetail shapein cross section. The regular grate bars are placed on this bar 2 bsliding them longitudinally of the latter ar until substantially theentire length of the bar is filled up, after which the master bars aresecured in place, thus retaining all the bars in their operativepositions. Each bar of the usual t e consists of a single piece of metaland as the eneral shape of the bars B-B shown in i ig. l. The barprovided by this invention consists of two parts or sections designatedas 3 and 4.-, respectively. The lower parts of these sections arenotched, as indicated at 5 and 6, respectively, to fit overthe oppositeedges of the support 2, and the section 3 has an upper extension 7 thatoverla s a similar extension 8 on the section 4. oles are drilledthrough these overlapping parts to receive fastenings 9 and 10 thatserve tosecure the two sections together in their operative positions.

' without disturbing the adjacent grate bars by knocking it out of theate when it comes around to the forward part of the grate, next placingthe sections 4 and 3 on the bar 2 inthe positions in which the are shownin Figs. 1 and 2, and finally drlving two pins or nails 9 and 10 throughtheoverlappmg parts of these sections, thus securing them together andcausing them to grip the dove-tail bar 2.

This entire relpairing operation can be performed while t e grate istravellin The objection to which prior constructions of this characterwere open thus is entirely avoided. Attention is particularly called tothe fact that this advantage is secured by making the grate bar insections which can be placed in their operative positions on the support2 by moving them transversely of the bar into the slot formerly occupiedb the broken bar. The peculiar shape of tlie meeting ends of thesections and the fact that the sections can be secured together simplyby driving pins nails, or slmilar fastenings through the holes in theoverlapping sections, also contribute to this result.

What is claimed as new is:

1. A gratebar for repair purposes comprising two sections notched toengage the opposite edges of a dove-tail grate bar support and havingparts that overlap when so mounted on said support, and means forsecuring said sections together.

2. A grate bar for repair purposes comprising two sections notched toengage the opposite. edges of a dove-tail grate bar support and havingparts that overlap when so mounted on said support, and pins ex-\tending through said overlapping parts and consisting of two sections,said sections being notched to engage respectively the opposite edges ofsaid dove-tail bar, said sections having grate surfaces and having partsthat overlap each other when so mounted on said supporting bar, andmeans'for securing said overlapping parts together. In testimony whereofI have signed my name to this specification.

CHARLES r. OAKMAN.

of a transbar mounted on said supporting bar and

